Why was the Roman Legionary's Equipment so good?

Arms & Armor of the Imperial Roman Legionary ( Arms & Armor )
The Ancient Roman legionary's clothing, arms, armor, and equipment (Top 10 items) mini-documentary
#Legionary #documentary #Rome
Other videos I have made concerning the Ancient Roman soldier
The Late Roman, Early Byzantine Infantryman (Fall of the Roman Empire History)
• The Late Roman, Early ...
The Byzantine Army, Dark To Golden Age
• The Byzantine Army, Da...
The Ancient Roman Helmet's evolution explained
• The Ancient Roman Helm...
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